Heat exchange tube



FIG. 1 is a front, right perspective of the heat exchange tube showingour new design;

FIG. 2 is a front view thereof, the rear view being a mirror imagethereof;

FIG. 3 is a left side view thereof, the right side view being a mirrorimage thereof;

FIG. 4 is a top plan view thereof, the bottom plan view being a mirrorimage thereof; and,

FIG. 5 is a reference view thereof illustrating a state in which thesubject design is combined wherein the broken lines shown are forillustrative purposes only and forms no part of the claimed design.

CLAIM The ornamental design for a heat exchange tube, as shown anddescribed.